998945393 has 2 divisors, whose sum is σ = 998945394. Its totient is φ = 998945392.

The previous prime is 998945369. The next prime is 998945401. The reversal of 998945393 is 393549899.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 950057329 + 48888064 = 30823^2 + 6992^2 .

It is a cyclic number.

It is not a de Polignac number, because 998945393 - 2²⁰ = 997896817 is a prime.

It is not a weakly prime, because it can be changed into another prime (998945093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499472696 + 499472697.

It is an arithmetic number, because the mean of its divisors is an integer number (499472697).

Almost surely, 2^998945393 is an apocalyptic number.

It is an amenable number.

998945393 is a deficient number, since it is larger than the sum of its proper divisors (1).

998945393 is an equidigital number, since it uses as much as digits as its factorization.

998945393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9447840, while the sum is 59.

The square root of 998945393 is about 31606.0974022419. The cubic root of 998945393 is about 999.6483406836.

The spelling of 998945393 in words is "nine hundred ninety-eight million, nine hundred forty-five thousand, three hundred ninety-three".